CELTIC fans were attacked in at least two incidents in a bar in Warsaw last night, according to reports.
One supporter is believed to have been injured in the clashes.
A spokesman for Celtic told the Daily Record that there had been a ‘couple’ of incidents, adding: “We are aware of attacks on Celtic supporters and we are currently investigating these.”
Between 150 and 160 Celtic fans travelled to the Polish capital for the match.
Legia were fined over £25,000 after their fans were found guilty of racist behaviour during a match against Welsh side The New Saints last August, and Slask Wroclaw supporters were involved in skirmishes after a Europa League qualifier three years ago against Dundee United, with three arrested.
Celtic fans were also caught up in violence when they travelled to Amsterdam to play Ajax last year, with a pub full of supporters coming under attack by hooligans the night before the match, leading to nine arrests.
Twenty eight Celtic fans were detained the following day after clashes between rival fans and police in the city centre.
Five fans were convicted but are appealing.